Thermal performance analysis of a natural convection air solar heater with corrugated absorbent and porous bed

• Autor: Quiñonez Choquecota, Jose
• Formato: artículo
• Fecha de Publicación: 2021
• Institución: Universidad Nacional de Ingeniería
• Repositorio: Revistas - Universidad Nacional de Ingeniería
• Lenguaje: español
• OAI Identifier: oai:oai:revistas.uni.edu.pe:article/1060
• Enlace del recurso: https://revistas.uni.edu.pe/index.php/tecnia/article/view/1060
• Nivel de acceso: acceso abierto
• Materia: abastecimiento de energía; balance energético; calefacción solar; transferencia de calor; energy supply; energy balance; solar heating; heat tranfer

The effect of the porous bed in a solar air heater with a V-corrugated absorbent plate and a design that facilitates free convection is analyzed, in terms of performance parameters and thermal efficiency. The collector was evaluated, with and without porous bed, under similar climatic conditions when mounted on a vertical wall. The results revealed that the mass flow is directly affected by the ambient temperature. It was observed that the porous bed affects the laminar sublayer of the absorbent plate generating greater turbulence that improves the rate of heat transfer, therefore, the collector with a porous bed presents a higher temperature inside and slightly decreases its efficiency. In addition, the porous bed works as a heat store that reduces instabilities which allows a uniform outlet temperature and allows to increase the operating time. The collector is inexpensive, respectful with the environment and feasible for space heating in frigid areas.